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EGR Valve With Integral BACKPRESSURE Transducer

  1. Loosen air cleaner and move aside without disconnecting vacuum hose from thermal vacuum switch on air cleaner housing.
  2. Inspect EGR system for proper hose routing, hoses in good condition and all connections tight. See "Ford Vacuum Diagrams" in this Section. 
  3. Check EGR valve assembly for obvious damage, looseness, or exhaust "blowouts" at gaskets. Repair or replace as required.
  4. Warm up engine to normal operating temperature. Place transmission in neutral. Slowly open and close throttle and watch valve stem. It should move up, oscillate and move down with throttle movement. If so, system is okay.
  5. If unable to see stem movements, open and hold steady throttle at 2000-2500 RPM. Remove and pinch off vacuum hose to EGR valve. Engine speed should increase.
  6. If valve operates as described above, the transducer is functioning properly. If not, replace the EGR valve.
  7. To test for leakage, remove and cap the EGR valve vacuum hose. Start the engine. If engine idle improves noticeably, check vacuum hose routing, as valve may have vacuum supply at idle.
  8. If engine idle does not improve, remove EGR valve. Block EGR passages with a plate. Start engine. If idle quality is still bad, the problem is elsewhere. Reinstall EGR valve. If idle quality improves, replace EGR valve.
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